Central-draft lamp



(No Model.)

Z. DAVIS. CENTRAL DRAFT LAMP.

Patented Nov. .19

N PETERS, Phom-Lllhngmphcr, wmm zm ac.

UNITED STATES PATENT OFFICE.

ZEBULON DAVIS, OF CLEVELAND, OHIO.

CENTRAL-DRAFT LAM P.

SPECIFICATION forming part of Letters Patent No. 415,502, dated November 19, 1889.

Application filed August 20, 1889. Serial No. 321,354. (No model.)

To all whom, it may concern:

Be it known that I, ZEBULON DAVIS, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Gen tral-Draft Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in central-draft lamps; and the objects of my invention are to provide a wick-raising mechanism for a central-draft lamp which is located, with the exception of the operatingknob, entirely inside of the lamp-bowl, and which is so constructed as to make leakage impossible; to make the wick-raising sleeve readily and easily detachable from its support or grip, and at the same time attach the wick securely to the raising-sleeve, so that it cannot possibly slip through 'it in either direction; and to form upon the lower edge of the spreader a horizontal deflecting-flange which forces the rising currents of air directly into the flame and makes it white and brilliant.

Figure 1 represents a vertical section of a lamp which embodies my invention. Fig. 2 is a section taken through the bowl at rightangles to Fig. 1, so as to show the wick-raising mechanism. Fig. 3 is a detached view of the sleeve support or grip. Fig. 4 shows a modification. Fig. 5 is a vertical section of the sleeve. Fig. (i is an enlarged section of the packing-chamber.

A represents the bowl, and Bthe centraldraft tube, inside of which is mounted in any suitable manner a rod or pintle C, which has its upper end to project a suitable distance ELbOXG the upper end of the centraldraft tube. Placed loosely upon the top of this rod or pintle O is the flame-spreader D, which consists of a top spreader-plate E and a perforated cylinder F, which projects vertically therefrom, and which cylinder is much smaller than the spreader-plate. The lower edge of this perforated cylinder is turned outward at any desired angle, so as to form a flange G, which serves to catch a portion of the uprising currents of air and to deflect them outward into the flame, thus greatly improving combustion and making awhite and brilliant flame. Where this flange G is not used, the currents of air have no outward movement, except where they pass through the perforated cylinder, and hence they are not deflected into and do not commingle with the flame near its base, and a more or less yellowish and dull flame is the result. As a more perfect and intense combustion is produced by deflecting the air out into the flame at its base, a more brilliant illumination is produced from a small flame than has heretofore been obtained.

Extending up through the bottom of one side of the bowl is the tube H, which has its upper end soldered to the casing or housing I, which is secured oil-tight to the under side of the top of the bowl. This casing or housin g may be made of any desired shape or size, but is intended only to be large enough to receive the operating-pinions, which are placed inside of it. Passing up through this tube from the outside of the bowl is the operatingrod J ,Which has the thumb-nut L secured to its screw is suddenly reduced in size at a suitable distance below the housing or casing, so as to prevent any capillary movement or delivery of the oil into the casing or housing. In order to further prevent the admission of any oil into the casing or housing, either when the bowl is tilted or by the oil creeping up the screw, a washer Q, of leather or other suitable packing, is placed against the bottom of the casin g or housing, and then this packing is incased or supported in position by a second casing R, which is soldered to the under side of the casing or housing I, and which casing R serves only to support the Y in its vertical movement; but that opening through which the screw passes isthreaded, so that the support or grip is moved positively in either direction by the turning of the screw. The inner end of the support or grip is bifurcated and the prongs extend any desired distance around upon opposite sides of the wick, and projecting inwardly from the ends of the prongs are the supporting flanges or projections T. At the center between the prongs are the two flanges U,which are separated just far enough from each other to allow the flange V upon the wick-raisin g sleeve WV to pass between them. sufficiently wide to rest' upon-the projecting points T, and is cut away upon one side, so that it can be readily inserted between one or two projections U. This wick raising sleeve has a number of pointed projections X stamped from it, and which projections project in opposite directions, so as to engage with the wick and prevent it from slipping through the wick-raising sleeve in either direction. After the wick has been passed through the wick-raising sleeve it is only necessary to place the wick-raising sleeve I upon the top of the support orgrip, so that the cut-away portion of the flange V will divide around the projections U, and then by giving the wick-raising sleeve a partial turn ineither direction the wick-raising sleeve and grip are locked together. When the screw is turned in one direction, the grip and wickraising sleeve are raised, and when turned in the other direction they are depressed. In order to allow the wick and its wick-raising sleeve to be inserted into and removed from the bowl, the outer wick-tube Y is made detachable.

lVhen it is desired to operate the wick from the top of the bowl, the construction shown in Fig. 4 will be used. The upper end of the screw 0 is reduced in size; but no packing-chamber is used, and a stationary rod H is used instead of the tube H to guide the grip S.

Having thus described my invention, I

claim- 1. The combination of the central drafttube, a supporting rod or pint-1e mounted therein, and the flame-spreader consisting of the spreader-plate and the perforated hollow cylinder, which is open at its lower end, so as to catch the rising currents of air, and provided with a horizontal flange at its lower edge, substantially as shown.

2. In a central-draft'lamp, a flame-spreader which issupported above the upper end of the central draft-tube, and which consists of top of the tube is secured, the operating-rod which passes through the tube and into the casing and is provided with a pinion at its upper end within the casing, a screw-rod placed in the bowl and provided with a pinion upon its upper end, which meshes with a pinion upon the operating-rod, a suitable packing, and a wick-raising device which is operated by the screw, substantially as set forth.

'4. The combination of the operating-screw which passes down through one side of the lamp, with the grip or support provided with the supporting flange or projections, and the wick-raising sleeve provided with a flange, substantially asspecified.

In testimony whereofI affix my signature in presence of two witnesses.

' ZEBULON DAVIS.

\Vitnesses:

PHILIP MAURO, F. A. LEHMANN. 

